Slack

Slack or Slacks may refer to:

Places

 * Slack, West Yorkshire, a village in Calderdale, England
 * The Slack, a village in County Durham, England
 * Slack (river), a river in Pas-de-Calais department, France
 * Slacks Creek, Queensland, Australia, a suburb of Logan City

Science and technology

 * File slack, a kind of computer internal fragmentation
 * Slack bus, an electrical power regulating system used to conduct load flow studies
 * Slack (project management), the time that a task in a project network can be delayed without delaying subsequent tasks or the overall project
 * Slack (software), a team communication tool that can be used for collaboration
 * Slack variable, a mathematical concept
 * Slack tub, used by a blacksmith to quench hot metal

People

 * Slack (surname), a list of people

Other uses

 * Slacks, another name for trousers
 * Slack Technologies, an American software company responsible for Slack software
 * Resource slack, the level of availability of a resource to a business
 * Slack, the central belief of the parody religion Church of the SubGenius
 * Slack coal, fragments of coal and coal dust; for example used in the Birchills Power Station
 * Slack, the valley or trough between dunes
 * Slack, not having tension (physics)
 * Slack action, free movement due to loose couplings between railway cars